How to gradually slow down a sample?

I'm trying to make a sample of a sound effect which gradually slows down over a period of maybe 5-10 seconds. Is there a simple way to do it (in Sonar X1)?

I don't mind paying for a plugin or separate app if it does a good job as long as it's not too expensive, but as it's probably only going to be used for this one sample I'd rather keep it cheapish/free!

Would something like this work?

http://wokwave.com/old-pl..._tapestop_effect_.html

The price is right, though you could donate to the cause.

Thanks all, I'd already tried Zargg71's idea but it introduced too many artifacts so was hoping for something that would give a smoother result. I'll try some of the other suggestions too - thank you all :)
 

I don't really mind about preserving pitch - it's more of a sound effect so musicality is not so much important.

I tried the Wok TapeBreak plugin suggested above but it didn't really have the right effect. However I then stumbled across a plugin called TapeStop which sounds like it might work perfectly. I'm playing around with it and it seems to be sounding good!

https://www.kvraudio.com/product/tapestop_by_tbt

James P
Thanks all, I'd already tried Zargg71's idea but it introduced too many artifacts so was hoping for something that would give a smoother result. I'll try some of the other suggestions too - thank you all :)
 

Did you bounce the stretched file? This will use the higher quality "offline" rendering algorithms and removes the artifacts. Without bouncing you are hearing the "online" algorithm which is just meant to preview such effects.
 
If you bounced and artifacts were still present then try again but open the clip in the Loop Constructor View. There go through and move/add/remove the "Split" markers so that there are splits right at the start of ALL the audio transients (most you can set up visually but also listen for noticeable transient sounds and place splits at those points as well). By doing that you make the stretching much more fluid/seamless. Again remember to bounce/render the stretched clip.
 
Also this type of stretching can be done really easily in Reaper (but you have to goof around with some somewhat confusing menus/settings sometimes which requires some study). I've been using Reaper as a companion tool to Sonar for various things like this. Better than messing around with plugins.
 
However Sonar is definitely more than capable of doing this very easily. It's all about the split points/prepping the audio for stretching.
 
Cheers.

I've had great success doing exactly this with Sugar Bytes' Turnado.  It's a third party plugin, and not especially cheap, but considering all the extra pretty whizz bang stuff you can do with it its a sensational, creative tool to have in your arsenal.  Recommended!
 
http://www.sugar-bytes.co.content/products/Turnado

This is what I use in SONAR: TapeStop FX by Studio Linked. However I have several Rapture Pro presets with a "tape stop" Instrument Page knob. This simplies applies a negative offset to pitch, that extends from no offset to the maximum range down.